MANISTEE — Eric Knysz and his wife, Sarah Knysz, are scheduled for preliminary examinations in Manistee County’s 85th District on Monday, Oct. 7. Eric Knysz, 19, is suspected of murdering Michigan State Police Trooper Paul Butterfield the night of Sept. 9 in Free Soil Township. He was arraigned Tuesday in Manistee for receiving and concealing a stolen firearm, carrying a…